python: backport 'drop Python3.6 workarounds'

Now that the minimum version is 3.7, drop some of the 3.6-specific hacks
we've been carrying. A single remaining compatibility hack concerning
3.6's lack of @asynccontextmanager is addressed in the following commit.

Signed-off-by: John Snow <jsnow@redhat.com>
cherry picked from commit python-qemu-qmp@3e8e34e594cfc6b707e6f67959166acde4b421b8
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

python/tests/protocol.py

@@ -8,7 +8,6 @@
 
 from qemu.qmp import ConnectError, Runstate
 from qemu.qmp.protocol import AsyncProtocol, StateError
-from qemu.qmp.util import asyncio_run, create_task
 
 
 class NullProtocol(AsyncProtocol[None]):
@@ -124,7 +123,7 @@ async def _runner():
             if allow_cancellation:
                 return
             raise
-    return create_task(_runner())
+    return asyncio.create_task(_runner())
 
 
 @contextmanager
@@ -271,7 +270,7 @@ async def _watcher():
                     msg=f"Expected state '{state.name}'",
                 )
 
-        self.runstate_watcher = create_task(_watcher())
+        self.runstate_watcher = asyncio.create_task(_watcher())
         # Kick the loop and force the task to block on the event.
         await asyncio.sleep(0)
 
@@ -589,7 +588,8 @@ async def _asyncTearDown(self):
     async def testSmoke(self):
         with TemporaryDirectory(suffix='.qmp') as tmpdir:
             sock = os.path.join(tmpdir, type(self.proto).__name__ + ".sock")
-            server_task = create_task(self.server.start_server_and_accept(sock))
+            server_task = asyncio.create_task(
+                self.server.start_server_and_accept(sock))
 
             # give the server a chance to start listening [...]
             await asyncio.sleep(0)